Specimens of the Jurassic brachiopod Goniorhynchia boueti from the Ranville area, Normandy, France, and from localities of Dorset, England, are shown to constitute biometrically separate populations, the French forms differing significantly from the British in several shape parameters, due probably to environmental factors. Accordingly, the collections are grouped in two subspecies--G. boueti boueti for the Normandy specimens and G. boueti goniaea for the Dorset forms.

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